generate descriptive commit messages by diffing against previous run

Loads the previous raw.json before saving, compares against current
crawl, and generates commit messages listing: new/departed representatives,
party changes, new disclosures, and total profiles updated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crawler.py

@@ -144,6 +144,8 @@ def main():
 
     bios = [get_bio(link, name, sleep_for) for link, name in zip(links, names)]
 
+    old_bios = load_old_bios(args.out)
+
     if not args.debug:
         save_raw(bios, args.out)
     save_individuals(bios, args.out)
@@ -156,12 +158,82 @@ def main():
     if repo.git.diff(name_only=True) == "":
         return
 
+    message = generate_commit_message(old_bios, bios)
     repo.git.add("*")
-    repo.index.commit(datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
+    repo.index.commit(message)
     origin = repo.remote(name="origin")
     origin.push()
 
 
+def load_old_bios(out):
+    try:
+        with open(f"{out}/raw.json", "r", encoding="utf-8") as f:
+            return json.load(f)
+    except FileNotFoundError:
+        return []
+
+
+def generate_commit_message(old_bios, new_bios):
+    old_names = {tuple(b["name"]): b for b in old_bios}
+    new_names = {tuple(b.name): b for b in new_bios}
+
+    added = [new_names[n] for n in new_names if n not in old_names]
+    removed = [old_names[n] for n in old_names if n not in new_names]
+
+    new_disclosures = []
+    for bio in new_bios:
+        key = tuple(bio.name)
+        if key not in old_names:
+            continue
+        old_discl = old_names[key].get("disclosures") or []
+        new_discl = bio.disclosures or []
+        old_items = {item for d in old_discl for item in d[1]}
+        new_items = {item for d in new_discl for item in d[1]}
+        for item in new_items - old_items:
+            new_disclosures.append((bio, item))
+
+    party_changes = []
+    for bio in new_bios:
+        key = tuple(bio.name)
+        if key not in old_names:
+            continue
+        old_party = old_names[key].get("party", "")
+        if old_party != bio.party:
+            party_changes.append((bio, old_party))
+
+    date = datetime.now().strftime("%Y-%m-%d")
+    sections = []
+
+    if added:
+        sections.append("Neue Abgeordnete:\n" + "\n".join(
+            f"- {b.name[1]} {b.name[0]} ({b.party})" for b in added
+        ))
+
+    if removed:
+        sections.append("Ausgeschieden:\n" + "\n".join(
+            f"- {b['name'][1]} {b['name'][0]} ({b.get('party', '')})" for b in removed
+        ))
+
+    if party_changes:
+        sections.append("Parteiwechsel:\n" + "\n".join(
+            f"- {b.name[1]} {b.name[0]}: {old} -> {b.party}"
+            for b, old in party_changes
+        ))
+
+    if new_disclosures:
+        sections.append("Neue Veröffentlichungen:\n" + "\n".join(
+            f"- {b.name[1]} {b.name[0]} ({b.party}): {item}"
+            for b, item in new_disclosures
+        ))
+
+    updated = len(new_bios)
+    sections.append(f"{updated} Profile aktualisiert")
+
+    title = f"Aktualisierung {date}"
+    body = "\n\n".join(sections)
+    return f"{title}\n\n{body}"
+
+
 def save_individuals(bios, out):
     for rep in bios:
         first_letter = rep.name[0][0].upper()